<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>数据统计</el-breadcrumb-item>
            <el-breadcrumb-item>数据列表</el-breadcrumb-item>
        </el-breadcrumb>

         <!-- 卡片视图区域 -->
        <el-card>
            <!-- 2 为ECharts准备一个具备大小（宽高）的Dom -->
            <div id="main" style="width: 800px;height:400px;"></div>
        </el-card>
    </div>
</template>

<script>
//1 导入echarts
import echarts from 'echarts'
//深拷贝
import _ from 'lodash'

export default {
    data() {
        return {
            //需要合并的数据
            options: {
                title: {
                  text: '用户来源'
                },
                tooltip: {
                  trigger: 'axis',
                  axisPointer: {
                    type: 'cross',
                    label: {
                      backgroundColor: '#E9EEF3'
                    }
                  }
                },
                grid: {
                  left: '3%',
                  right: '4%',
                  bottom: '3%',
                  containLabel: true
                },
                xAxis: [
                  {
                    boundaryGap: false
                  }
                ],
                yAxis: [
                  {
                    type: 'value'
                  }
                ]
                    }
            }
    },
    created() {},
    //此时，页面上的元素，已经渲染完毕了
    async mounted() {
        // 3 基于准备好的dom，初始化echarts实例
        var myChart = echarts.init(document.getElementById('main'));

        const {data: res} = await this.$http.get('reports/type/1')
        if(res.meta.status !==200) {
            return this.$message.error('获取折线图数据失败！')
        }
        // 4 准备数据和配置项
        const result = _.merge(res.data,this.options)

        //5 展示数据
        myChart.setOption(result)
    },
    methods: {}
}
</script>

<style lang="less" scoped>

</style>